نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری دانشگاه تهران

2 دانشیار دانشگاه تهران‌

3 استاد دانشگاه تهران‌

4 استاد انستیتو پاستور ایران

چکیده

اندام مجری از حافظه حرکتی در حرکات نامتقارن دودستی به تفاوت در ویژگیهای خاص حرکت دودست بستگی دارد و نیاز به بازنگری دارد.
هدف پژوهش حاضر‌ ارزیابی تاثیر تغییر در ویژگیهای مختلف حرکات دو دست بر انتقال حرکت دودستی نامتقارن به الگوی عکس بود و به بررسی فرضیه‌ی استقلال اندام مجری از حافظه حرکتی پرداخته شد.
ابزار مورد استفاده در پژوهش حاضر شامل قلم نوری با حسگر ویژه، لپتاپ، دستکش ویژه و مترونوم بود. آزمودنیهای تحقیق شامل دانشجویان راست دست پسر (تعداد ۳۰ نفر) بودند که در سه گروه قرار گرفتند. هر گروه حرکت دودستی نامتقارنی را تمرین می-کردند که در آن حرکت دو دست از نظر ویژگیهای مختلفی تفاوت داشتند (گروه ۱: اثر نیروی جاذبه، گروه ۲: الگوی زمانی، گروه ۳: اندازه حرکت). گروه‌ها پس از پیش آزمون به مدت چهار روز تمرین نموده سپس پس‌آزمونها به عمل می‌آمد.
نتایج نشان داد که در حرکات دودستی نامتقارنی که حرکات دو دست از نظر اثر نیروی جاذبه بر دو دست متفاوت باشد، انتقال مثبتی به حالتی که حرکت دو دست معاوضه می‌شود صورت می‌گیرد. اما اگر تفاوت در الگوی زمانی باشد انتقالی مثبت صورت نمی‌گیرد و در واقع انتقال صفر است و هنگامی که حرکت دو دست از نظر اندازه حرکت متفاوت بود، این انتقال منفی بود.
بطور کلی بر حسب اینکه تفاوت در الگوی نامتقارن دودست جزء ویژگی‌های کنترلی چه سطحی از سلسله مراتب کنترل سیستم عصبی باشد، ممکن است به الگوی وارونه آن منتقل شود یا نشود. بنابراین استنباط می‌شود که فرضیه استقلال

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The effect of change in different characteristics in movements of two hands on transfer of asymmetrical bimanual movement to its converse pattern

نویسندگان [English]

  • Mohammad Reza Doostan 1
  • Mehdi Namazi Zadeh 2
  • Mahmood Sheykh 3
  • Naser Naghdi 4

چکیده [English]

The aim of this study was the evaluation of the effect of changes in different characteristics in movements of two hands on transfer of asymmetrical bimanual movement to its converse pattern, and effector-independent hypothesis from motor memory was investigated.
The instrument used in this study included pen Mouse, laptop, special glove and metronome. The subjects of the research were right-handed male students. Thirty right-handed subjects participated in the experiment, that practiced asymetrical bimanual coordination task In three groups. The movement patterns of two hands were different from each other in motor features (Group 1:The effect of gravity, Group 2:velocity pattern, 3:amplitude of movement). Each of the test groups after the practice run for four days and then tests were performed.
The results showed that when asymmetries in two hands that perform the bimanual movement is the effect of gravity on hands, transfer to vice versa pattern is positive. However, when the difference is in velocity pattern there is a positive transition and the transition is zero, and when the two hands movement patterns are different in amplitude of movement, transfer was negative.
The research shows that in terms of the differences in the pattern of asymmetric of two hands is controlled in what level of the hierarchy of nervous system, it is possible that bimanual movement transfer to reverse pattern or not. It can be concluded that the effector-independent hypothesis from motor memory in bimanual movement coordination depends on difference between the two hands special features,Soneed for revision.

کلیدواژه‌ها [English]

  • Transfer
  • bimanual coordination
  • effector-independent hypothesis
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